MicroRNA-214-3p Delivered by Bone Marrow Mesenchymal Stem Cells-Secreted Exosomes Affects Oxidative Stress in Alzheimer's Disease Rats by Targeting CD151.

OBJECTIVE: This study probed the effect of targeted regulation of CD151 by microRNA-214-3p (miR-214-3p) delivered by bone marrow mesenchymal stem cells-secreted exosomes (BMSCs-exo) on oxidative stress and apoptosis of neurons in Alzheimer's disease (AD). METHODS: Rat BMSCs were isolated, from which MSCs-exo were extracted and identified. The AD rat model was established and injected with MSC-exo suspension. Meanwhile, miR-214-3p and CD151 interfering lentivirus were transfected in MSCs. After injection, learning and cognitive ability of the rats were assessed, as well as neuronal apoptosis and oxidative stress injury. miR-214-3p and CD151 levels were determined, and their relationship was explored. RESULTS: AD rats had prolonged escape latency, weakened learning and cognitive ability, increased neuronal apoptosis in the hippocampal CA3 region, and aggravated oxidative stress. After MSC-exo injection, these changes in AD rats were partially rescued. CD151 was targeted by miR-214-3p, and MSC-exo improved AD in rats through the miR-214-3p/CD151 axis. CONCLUSION: MSC-exo down-regulates CD151 by targeting miR-214-3p to enhance antioxidant capacity, thereby improving the pathological injury of AD rats.